Colossians 2:11 In Him you were also circumcised with the circumcision made without hands, by putting off the body of the sins of the flesh, by the circumcision of Christ
When Abraham entered into covenant with God, circumcision was given as the sign of the covenant. The shedding of blood, the cutting away of the flesh. For thousands of years the Jews have continued this tradition of marking themselves in their flesh as sons of the covenant.
But when Christ came, I (though a female) was circumcised with Christ. I was marked as a son of the new covenant by the tearing of the flesh and the shedding of the blood of Jesus.
My own flesh is circumcised by the work of the Holy Spirit, who takes the sword of God’s Word, and as a skillful surgeon, cuts away the flesh and all of its dead works.
At times I have though it good to provide some help to this process. It never ends well, as I find myself amputating indiscriminately, and bleeding out in horrible pain. I’m am not skilled in such a holy work. My job is to stay still and let Him operate.